android - 使用替换时 FragmentManager 崩溃

Question

我有一个 Activity 和几个 Fragments。我必须替换 FrameLayout 中的 fragment 。但是，当我使用此功能时，我的应用程序崩溃了。下面是函数代码

Android.Support.V4.App.Fragment fragment = null;
        switch (position) {
        case 0:
            fragment = new ScheduleFragment();
            break;
        case 1:
            fragment = new MainFragment();
            break;
        }
        if (fragment != null) {

            Android.Support.V4.App.FragmentManager fragmentManager = SupportFragmentManager;
            var transaction = fragmentManager.BeginTransaction();
            transaction.Replace(Resource.Id.content_frame, fragment);
            transaction.Commit();

            mDrawerList.SetItemChecked (position, true);
            SetTitle (mScreenTitles [position]);
            mDrawerLayout.CloseDrawer (mDrawerList);
        } else {
            Log.Error (this.Class.Name, "Error, fragment not created");
        }

这是一个错误:

Java.Lang.RuntimeException: java.lang.reflect.InvocationTargetException at --- End of managed exception stack trace --- at java.lang.RuntimeException: java.lang.reflect.InvocationTargetException at at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694) at Caused by: java.lang.reflect.InvocationTargetException at at java.lang.reflect.Method.invoke(Native Method) at at java.lang.reflect.Method.invoke(Method.java:372) at at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899) at ... 1 more at Caused by: md52ce486a14f4bcd95899665e9d932190b.JavaProxyThrowable: System.TypeLoadException: Could not load type 'Android.OS.BaseBundle' from assembly 'Mono.Android, Version=0.0.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065'. at Android.Views.View.n_OnSaveInstanceState (intptr,intptr) [0x00009] in /Users/builder/data/lanes/monodroid-mavericks-monodroid-5.1-series/d23da369/source/monodroid/src/Mono.Android/platforms/android-19/src/generated/Android.Views.View.cs:14822 at at (wrapper dynamic-method) object.e0a03ea8-44fe-4482-bf92-bc99edac0352 (intptr,intptr) at at md5d7f0962782a324dbc9992a12c8322ca0.PagerSlidingTabStrip.n_onSaveInstanceState(Native Method) at at md5d7f0962782a324dbc9992a12c8322ca0.PagerSlidingTabStrip.onSaveInstanceState(PagerSlidingTabStrip.java:86) at at android.view.View.dispatchSaveInstanceState(View.java:13550) at at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:2859) at at android.view.ViewGroup.dispatchSaveInstanceState(ViewGroup.java:2865) at at android.view.View.saveHierarchyState(View.java:13533) at at android.support.v4.app.FragmentManagerImpl.saveFragmentViewState(FragmentManager.java:1639) at at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1023) at at android.support.v4.app.FragmentManagerImpl.removeFragment(FragmentManager.java:1233) at at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:696) at at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1499) at at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:456) at at android.os.Handler.handleCallback(Handler.java:739) at at android.os.Handler.dispatchMessage(Handler.java:95) at at android.os.Looper.loop(Looper.java:135) at at android.app.ActivityThread.main(ActivityThread.java:5221) at ... 4 more

布局。

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/drawer_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/gradientshape">
    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <TextView
            android:text="УНИИ-ИТ, 1 курс, 11 - ПГ"
            android:textAppearance="?android:attr/textAppearanceSmall"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/info"
            android:textColor="#ffffffff"
            android:gravity="center_horizontal" />
        <TextView
            android:text="понедельник, 11 мая"
            android:textAppearance="?android:attr/textAppearanceSmall"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/dayOfMonth"
            android:textColor="#ffffffff"
            android:gravity="center" />
        <android.support.v4.view.ViewPager
            android:id="@+id/pager"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="#00000000"
            android:fadingEdge="vertical" />
    </LinearLayout>
    <ListView
        android:id="@+id/left_drawer"
        android:divider="@android:color/transparent"
        android:dividerHeight="0dp"
        android:choiceMode="singleChoice"
        android:layout_width="220dp"
        android:layout_height="match_parent"
        android:layout_gravity="start"
        android:background="#111" />
</android.support.v4.widget.DrawerLayout>

我还为 viewPager 中的 fragment 加载了 fragment 布局。 这是它:

<ListView
    android:minWidth="25px"
    android:minHeight="25px"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/LessonsView"
    android:layout_marginLeft="5dp"
    android:padding="15dp"
    android:divider="@null"
    android:dividerHeight="0dp"
    android:layout_marginTop="5dp"
    android:layout_marginRight="5dp"
    android:layout_marginBottom="5dp" />

以及 ViewPager 中 ListView 项的布局。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:padding="1dp"
    android:layout_marginTop="5dp">
    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:minWidth="25px"
        android:minHeight="25px"
        android:layout_marginTop="5dp"
        android:layout_marginBottom="0.0dp"
        android:background="@drawable/border">
        <TextView
            android:text="   1"
            android:id="@+id/PairNumber"
            android:layout_width="35.5dp"
            android:layout_height="wrap_content"
            android:gravity="top"
            android:background="@drawable/triangle"
            android:alpha="0.8"
            android:layout_gravity="left"
            android:textColor="#ff000000"
            android:textAlignment="center" />
        <LinearLayout
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <TextView
                android:text="Инновационный менеджмент и развитие информационных технологий"
                android:textAppearance="?android:attr/textAppearanceSmall"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:id="@+id/pairTitle"
                android:layout_marginTop="7dp"
                android:textColor="#ff000000" />
            <TextView
                android:text="Лекция"
                android:textAppearance="?android:attr/textAppearanceSmall"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:id="@+id/pairType"
                android:layout_marginTop="2dp"
                android:textColor="#ff949494" />
        </LinearLayout>
    </LinearLayout>
    <View
        android:padding="5dp"
        android:layout_width="fill_parent"
        android:layout_height="0.5dp"
        android:background="#ffe5e8ea"
        android:alpha="1" />
    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:divider="?android:dividerHorizontal"
        android:minWidth="45px"
        android:minHeight="115px"
        android:background="#ffffff"
        android:paddingRight="2dp"
        android:paddingLeft="2dp"
        android:paddingTop="-1dp">
        <ImageView
            android:src="@drawable/icon_teacher"
            android:layout_width="35.5dp"
            android:layout_height="match_parent"
            android:id="@+id/imageView1"
            android:scaleType="center"
            android:layout_weight="0"
            android:adjustViewBounds="false"
            android:cropToPadding="false"
            android:layout_marginTop="2dp" />
        <LinearLayout
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="#ffffff"
            android:layout_gravity="center">
            <TextView
                android:text="Миленко"
                android:textAppearance="?android:attr/textAppearanceSmall"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:id="@+id/Teacher"
                android:textColor="#ff000000"
                android:layout_gravity="center" />
        </LinearLayout>
    </LinearLayout>
    <View
        android:layout_width="fill_parent"
        android:layout_height="0.5dp"
        android:background="#ffe5e8ea"
        android:alpha="1" />
    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:divider="?android:dividerHorizontal"
        android:minWidth="45px"
        android:minHeight="115px"
        android:background="#ffffff"
        android:paddingRight="2dp"
        android:paddingLeft="2dp">
        <ImageView
            android:src="@drawable/icon_place"
            android:layout_width="35.5dp"
            android:layout_height="match_parent"
            android:id="@+id/imageView1"
            android:scaleType="center"
            android:layout_weight="0"
            android:adjustViewBounds="false"
            android:cropToPadding="false"
            android:layout_marginTop="1dp" />
        <LinearLayout
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_gravity="center">
            <TextView
                android:text="Корпус:1, Аудитория 314"
                android:textAppearance="?android:attr/textAppearanceSmall"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:id="@+id/pairPlace"
                android:layout_gravity="center"
                android:gravity="left"
                android:textColor="#ff000000" />
        </LinearLayout>
    </LinearLayout>
    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:weightSum="4"
        android:minWidth="45px"
        android:minHeight="45px">
        <TextView
            android:text="20:15-21:45"
            android:textAppearance="?android:attr/textAppearanceSmall"
            android:layout_width="wrap_content"
            android:layout_height="35dp"
            android:id="@+id/pairTime"
            android:layout_weight="3"
            android:background="@drawable/timebackground"
            android:gravity="center"
            android:layout_gravity="top"
            android:textColor="#ff000000" />
        <Button
            android:text="Напоминать"
            android:layout_width="wrap_content"
            android:layout_height="35dp"
            android:gravity="center"
            android:id="@+id/NotifyBtn"
            android:layout_weight="1"
            android:textAppearance="?android:attr/textAppearanceSmall"
            android:background="@drawable/buttonbackground"
            android:textColor="#ffffffff"
            android:layout_gravity="right"
            android:drawableRight="@drawable/button_notify_inactive"
            android:textSize="12dp"
            android:alpha="0.9" />
    </LinearLayout>
</LinearLayout>

Answer 1

基于这个 fragment 我不确定，但如果你试图访问 Android 资源 Id，如前人提到的，你需要在 Xamarin 中使用 Android.Resource.Id。

如果这不是你想要的，我会问你是否在你想要的容器内有一个 id content_frame 的 FrameLayout。

我设计了我的布局并包含了一个 FrameLayout，这是我使用 SupportFragmentManager 切换进出的内容。